Machine for



D. McMAsTER MACHINE FOR APPLYING PLASTER Filed April l0. 1926 Dec. 27, 1927.

D. MQMASTER MACHINE FOR APPLYING PLAsTER 2 sheefs-sheet 2 Filed April 10'; 1926 INVENTOR m//a Mc. Maier ATTORNEY Patented Dec. 37, 1927.

n stares DAVID `llllfollflASTER, F` SEATTLE, WASHINGTON.

BIAGI-HNE FOR .APPLYING PLASTER.

Application filed April l0, 1926. Serial No. 101,091.

My invention relates to improvements in plastering machines and the object of my invention is to provide a machine of simple and etiicient construction that Will put plas- '5 ter on a wall taeter and cheaper than it can be put on by hand. y

Another object is to provide a plaster-ing machine that will permit the plaster to be applied entirely up to and into the corners formed by intersecting walls and ceilings.

A. further object is to provide a plaster'- ing machine which applies the plaster or mortar to the 'Wall in Substantially `the same manner as it is applied by` an ordinary plasterers trovvel, thus :insuring a proper clinching ot the plaster and thereby insuring per manence and durability ot the Work.

i further object is to provide a portable plastering machine having means for accurately and evenly finishing the surface o' the Work. n

Other and more specific objects Will be apparent from the following description taken in connection with the accompanying drawing;

in the drawings Figure 1 is a view in vertir mid-section ot a plastering machine constructed in accordance With my invention parts being shown in elevation.

F is a view in iront elevation oi' the same. y f Fig. 3 is a view in cross section substantially on broken line 3-3 ot Fig. 1.

FW' i isV an enlarged fragmentary view ion ot a detailv oi2 the invention. 5 is a 'fragmentary sectional view of the machine showing the mortar box or hopper at the uppermost limit of its movement `and illustrating the manner of applying the y plaster to that portion ot a Wall adjacent an intersecting; ceiling.

Vld`igs. t3 and 7 are perspective views of the mortar box or hopper and the movable partition tor the same respectively.

leterring to the drawings,` throughout which like reference numerals designate like parts.` 1 show an upright 'lrame'composed ot :tour posts 8, arranged in rectangle formation and rioidly secured together at their bottom ends by suitable cross members 9. The upper portion ot the :trame is preferably formed oit tour channel bars 10, of smaller size than the channel bars forming the posts 8 and telescopically disposed Within said posts 8, to thereby constitute an extensible trame that `may be adjusted as to height.r The postsv l0 are secured together at theirjtop ends by cross bars `11* and said posts 10 are adjustably secured to the posts 8 by suitable bolts l2. i

The upright trame formed by posts 8 and lO ismcunted on suitable wheels 13, so that it may be easily andfconvemently moved.

rlhe tWo Wheels 13 the iront side of said 'frame are arranged in alignment so that they may be caused to move along a cleat or straight edge 14 that is `placed on the floor on which the machine is supported, adjacent to a wall to Which plaster is to be applied.

`Mounted t'or vertical movement at the front oit the machine is a mortar box or hopper. .comprising a bottom 15,and two upright end members 16. |The rear edges ci' the end members 16 are arranged to rest againat and be guided by the front frame members 8. The hopper bottom 15 extends rearward beyond lthe iront `trame members 8, as shown in Figs. l., 3 and 6, forming a platform 17 Which platform is notched as at 18 to iitover the front frame members.

A downwardly extending plate 20, hereinatter termed a troivel member7 is hinged by pivot member 21 to the frontv edge of the hopper bottom 15, and extends downn WardlyA from said hopper bottom 15 at an angle inclined slightly forward from the vertical. The trowel member 20 is -sup ported at each end by slotted strap members 21, adjustably held by bolts 22, so that the angle of `inclination oit said troWel may be varied relative to a Wall upon which it is operating. e

A partition member is slidably disposed vvithin the hopper and constitutes a movable rear Wall 'for the same, said partition member serving to torce mortar which may be placed in the hopperoutwardly over the trowel member 20 When it is moved forwardly. Angular braces 24 are secured to the rear side of the partition 23 andarranged to rest upon the platform 17 and be guided by cleats 25on said platform,` tor guiding and supporting said partition 23.

A kt'eed screw S36 is secured to the centerV ot the partition n3 on the `rear side and eX- tends rearwardly therefrom. A pinion 27 is threaded on to the feed screWi 26 and is arranged to mesh Vwith a vertical gear-rack 2S, so Ithat as the hopper, together with i'eed screw 26 and pinion 27,is moved verh'ereinafi'ter explained.

tically, the pinion 27 will be rotated and will move the partition 2. rearwardly within the hopper.

The rack bar 25 is supported and reinforced by a vertically arranged channel member 30 that rests against the rear edge ot the same. A U-shaped bracket 3l extends around channel member 30 and rack bar 28 and forms a bearing Jr'or the hub portion of the pinion 27, through which the feed screw passes, so that said pinion will always be heldL fully in mesh with the aclr bar 28. A roller 32 may be'pi'ovided in the outer end of the bracket 31 to relieve the thrust against the pinion 27. A

An angular bracket 33 is rigidly secured to the rear end ot platform 1T, so as to eX- tend upwardly and forwardly therefrom and said bracket 83 has a roller 84: in its upper end that is arranged to roll upon the vertical channel bar 30 as the hopper is moved up and down.

A hole is necessarily provided in platform 17 to permit the raclr bar 28 and channel 'member' 30 to pass through said platform. The channel member 30 is rigidly secured to the traine oi the machine at the bottom and a section 36 oitl the rack bar 28 at the bottom end is removably secured to said channel member 3() so that it may be detached tov permit the .pinion 27 to be turned hand on feed screw 3G to properlyl position the partition member 28 in the hopper" for walls ot ditl'erent heights as To provide adjustment as to height at the upper ends of the rack member 28 and channel 30, l preferably provide with each machine a plurality of sections ot `said rack bar and channel member, each ot different length to correspond to different standard heights oit' ceilings', said raclr bar and channel member sections preferably having dowel connections with the main sections of saidchannels and rack bar, as indicated at 37.

The hopper and parts connected therewith are' supported for vertical movement by three cables 40', el, and ft2, arranged respectively at the two sides just in iront of the frame members 8, and near the middle at the rear end of the platform 17. These cables pass upwardly over rollers l5 and 44, thence downwardly and are wound upon drums l5 on a transverse shaft e6 that is mounted on the rear fame members' 8. Theends o't the transverse shaft i6 are preferably squared sov that a crank arm 47 may be applied to either end to turn said shaft and raise or lower the' hopper. The ends of shaft LG-are necessarily within the limits of the width of the frame so that said trame may be moved closely against a wall.

A linishing member or stiaight edge 50 is arranged to' be detachably secured to either of the front frame members 8 so that it may 'forwardly or' le drawn over plaster thaty has just been applied by moving the machine sidewise, to thereby linish the surface ot said plaster. 'lhe straight edge 5() extends continuously l'rom 'the floor to the ceiling ot the room that isbeing plastered and a plurality ot said straight edges ot different lengths may be :turnished with the machine to accommodate dii'l'erent heights ot ceilings. ySuitable ratchet means i9 may be provided or selecv.7

tively locking the shalt 'against rotation in either direction.

"lo prevent mortar trom being forced out at the sides et the hopper along the 'r-ont edges, l provide adjustable end plates 5l 'that are adjustably secured to the ends 16 by slot and bolt means 52 and are arranged to be moved forwardly in close proximity to a wall. "he plates 5l may be adjusted to eoinpnensate tor adjustments in the angularity or the trowel member 20.

ln the operation of this plastering machine, the machine is placed in front or' a wall 53 which is lathed or otherwise proporly prepared iter the reception ot plaster. `guide member lil to guide the machine for movement across the iioor parallel to the wall secured to the floor 54 on which the machine rests in such a manner as to Jorm a straight trackway parallel to, and at the proper distance from the wall so that the front pair et wheels 13 that support the machine may press against, and be moved along, said guide member, thus keeping` the machine always at a constant distance from wall.

'lhe machine is set up at the location where the first strip or swath of plaster is to be applied, usually in a corner ot the room', with the lower edge ot the trowel member 2O at the proper distance from the wall to apply a coat ot plaster o'l` the desired thickness. The partition plate is positioned by adjusting the pinion 2T on the feed screw 26 so that said partition plate will be moved inwardly to a position distant from the wall 53, substantially the thicl'rness of the coat ot plaster that is beingl applied in moving the hopper' from the lowermost position, Fig. l, to the uppermost position, Fig. 5. This may be set by trial byl raising and lowering the hopper, but can ordinarily be set by gauge or measurement for walls where the ceiling is of standard height. rllhe hopper, in its lowermost position, Fig. l, is then filled preferably level full of mort-ar, the

side plates 51 having been adjusted into close proximity to the wall 53. The hopper is then raised by turning the shaftl Ll@ and as it moves upward the pinion 27, meshing with raclr 28 moves partition member 23 forward, 'forcing mortar outward over the upwardly moving trowel member 2O which operates in the same manner as an ordinary plasterers trowel' to rub such mortar onto llO the wall and to eauseit to pass between the lath or equivalent means and clinch properly on the rear side. In this manner the machine applies a strip or swath of plaster the width oil the trowel member as it moves up along the wall. The movement oi' the partition member 23 is gauged so that when the top o'if the hopper strikes against the ceiling 55, Fig; 5, the liront surface of the partition member' will be in substantially the plane of the .finished wall 'or a distance equal to the thickness ot' the coat oi' plaster from the front sides of the lath and the mortar t apped Vbetween said partition and the wall will be "forced against the lath and squeezed `between said lath and properly clinched,

thus iinishing the swath orP plaster entirely to the ceiling. While the hopper is thus held in its uppermost position the straight edge or finishing member 50 is adjusted into the correct position and the entire machine is moved sidewise drawing the partition member 23 sidewise across the plaster that is held between said partition member and the wall and then drawing the straightedge 50 sidewise across the entire newly applied swath of plaster giving the same a true and even inish.` In working in a corner the straight edge 5() is necessarily removed while the first swath of plaster is being applied and is put on and adjusted to the wall after the machine has been moved outwardly a short distance from the wall.V The straight edge 5() is reversible and may be placed on either side oi' the machine. Diierent finishes may be secured on the plaster surface by varying the angle of the trowel 2O and straightedge 50.

ln outside plaster work, as in applying stucco linish, andv in inside work where ceilings do not interfere, the trowel member may be allowed to move entirely to the top of the wort; that is being applied. Obviously this can not be done in inside Work where there are ceilings and the means for applying the plaster adjacent to the ceiling constitutes an important part of my invention. i

The trame is rigid and substantial and will ordinarily withstand any back thrust that may be applied thereto by the trowel 2O and associated parts without yielding. lf necessary when the trame is extended a brace member may be attached to the upper position ot the :trame n'iembers 8 so as to extend rearward and downward to a suitable rigid footing.

The angle brace 33 serves to brace the hopper 'For vertical movement along the frame.

'lhe machine is strong and simple in constrlution` reliable and eiiicient in operation, not liable to get out oi order, can be operated by one man, and is capable oi' applying plaster very much faster than it can be applied by one man by hand.

The foregoing description and-accompanying drawings clearly disclose a preferred embodiment ot my invention but it will be understood that this disclosure is merelyillustrative and that numerous changes in the machine may be'resorted to within the scope and spirit ot the following claims.

l claim:

l; lny a plastering machine, a hopper, a trowel member at one side ojtsaid hopper and external to said hopper and pivotal'ly and adjustably connected with one edge ot said hopper,v and means for feeding mortar from said hopper outwardly over said trowel member.

2. ln a plastering machine, a frame, a hopper movable on said frame,fa trowel member at one edge vof said hopper, saidV trowel member being entirely on the exterior of said hopper and being pivotaliy connected with the edge oi" the hopper, means for adjusting the angular position of said trowel member, and means 'for feeding mortar from sad hopper outwardly over said trowel member.

3. In a plastering machine, a i'rame, a hopper movable on said ltrame, a trowel member pivetally connected with one edge of said hopper and extending outwardly therefrom at substantially right angles to the adjacent side oi' the hopper, means for rigidly supporting said trowel member in various'adjusted angular positions and a movable partition in said hopper 'for forcing mortar outwardly over said trowel.

fi. ln a plastering machine a hopper arranged to be Vguided tor movement along a wall the side of said hopper adjacent the wall being open in close proximity to the wall, an inclined trowel member adjustably connected with one edge of saidA hopper, and arranged to be adjusted into different angular positions, side plates adjustab'ly connected with the edges ofV said hopper at each end or' said trowel member, and means for feeding mortar from said hopper outwardly over said trowel member.

" 5. In a plastering machine a irame, a hopper movable along said frame, said hopper being open at one side and being adapted to be positioned with its open side adjacent a wall that is to be plastered, a trowel member arranged to extend along said wall in close proximity thereto and at a comparatively slight angle relative to the plane of the wall; said trowel member being entirely outside oi' said hopper and pivotally connected with one edge oit the open side of said hopper, means for adjusting the angular position of said trowel member and a partition in said hopper arranged to be moved automatically to torce mortar outwardly 'from the open side of said hopper against the wall.

6u ln a plastering machine, a frame, a hopper movable on said frame, a trowel member connected with one edge of said hopper, a partition member movable within said hopper and means operated by movementoi said hopper, 'for moving said partition `member within said hopper when said hopper is moved on said frame to torce mortar outwardly over-said trovvel member.

Y, in a plastering machine, a n'iovable hopper and a trowel member adjustably connected with one edge ot said hopper and arranged to be set at different ano'les reiative to the plane of a wall along which seid trowel member is movable.

8. In a plastering machine, a frame, vertica/ily movable hopper, open at the forward ood, sido Platos' adir-stably Sooiuod to the Sido edges of said hopper and movable toward and. over from o Well to vhoh Plaster is be ing. applied, a trowel member secured to the forward edge 'of the bottom oi said hopper and intending downwardly and forwardly therefrom, the frontend oif saidhopper be.- ing open, a movable partition forming the rear wall of said hopper and means for moving said partition forwardly as said hopper is moved, inwardly- 9. aplastering machine, an upright trame arranged to be Supported adjacent a wall, av hopper guided tor vertical movement on said iframe, said hopper being open at the i'rront, trowel member hing-ed tothe bottom ot said hopper at the front edge, and extending'. downwardly therefrom, means Ytor supporting said trowel member in adjusted angular-positions, a partition i'orming a movable rear Wall for said hopper, a eed screw comieeted with said partition, and means operated by the vertieal movement of said hopper mov-ing said feed 5.oi-iov and Said partitionl0-Y to a 'plast-ros readline en upright frame arranged to be supported' adjacent a wall, a hopper guided for vertieal move-i ment on said iframe, said hopper being open at the front, a trowel member hinged to the bottom oi said hopper at the front edge and extending downwardly there roi-n, means for supporting said trowel member in adjusted weer@ angular positions, a partition forming a movable rear wall ytor said hopper, a ii'feed screw connected with said partition, a pinion havv ing ay hub threaded onto said feed screw, a vertical rack, means for holding said pinion in mesh with said rack, and cable operated hoisting means tor. raising and lowering` said horror ll. in a plastering machine of the class describedA an upright trame, wheels snp- A 'fi l traine for movement over a niet., 1 an adapted to oloiv horizontal guides, o horror ranged for vertial movement at the front of said traine, the front o't' said hopper being open, andthe bottom ,of said hopper exoedas reoivardlv bevor-d the Sido. Wells of the saine, a trowei member extending downwardly at a slight forward incline from the dem @are of the bottom @jf Said hopper and. arranged to have mortar discharge thereoxjer, Va partition member forming.' a movable rear wall lor said hopper, brace means on the rear side of said partition member siidabiy guided on the rearwardly'protruding bottom of said hopper, means for raising and lowering said hopper and lmeans for imparting movement to said partition memberV in a predetermined ratio to the niiovement of said hopper. Y

lL. in a piastering machine, an upright portable frame, means for guiding said frame for sidewise movement parallel to and in close proximity to a wall, means earried by said frame for depositing mortar on a wall and a removable straight edge carried by frame ,for 'smoothing mortar on said wall when said :trame is moved sidewise.

In a plastering machine an upright portable traine arranged to be guided for sidewise movement parallel to a wall means ,carried by said traine for depositing inortar on said wall, and means carried by one side oi said :trame for smoothing said mortar when said frame is moved sidewise.

Tho foregoing Spoootioo Signed at Soottle, Washington, this 31st day of Mar. 1926.

DAVD MGMSTER. 

